Not many Americans are aware of the Christero War in Mexico. It started when, in 1917, Mexico had a revolution that resulted in the installation of the world's first socialist government. In the 1920s and 30s that same government persecuted the Church, closing hundreds of churches and converting the buildings to secular uses, suppressing religious communities, and hunting priests with an Elizabethan ardor. This is where we get Blessed Miguel Pro from, along with many other martyrs. Even the Shrine of Our Lady of Guadeloupe was under threat! (The Indians defended their shrine and sent the miraculous image of Our Lady to Costa Rica until it was safe to return it.)
What I learned to day is that the US government helped the Mexican Government in their endeavor in various ways, in the interest of "maintaining order".